Keyword: wakefield
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MOPG40 Performance Studies of a Single Vertical Beam Halo Collimation System at ATF2 background, collimation, simulation, optics 139
  • N. Fuster-Martínez, A. Faus-Golfe
    IFIC, Valencia, Spain
  • P. Bambade, A. Faus-Golfe, S. Wallon, R.J. Yang
    LAL, Orsay, France
  • K. Kubo, T. Okugi, T. Tauchi, N. Terunuma
    Sokendai, Ibaraki, Japan
  • K. Kubo, T. Okugi, T. Tauchi, N. Terunuma
    KEK, Ibaraki, Japan
  • I. Podadera, F. Toral
    CIEMAT, Madrid, Spain
  Funding: Work supported by IDC-20101074, FPA2013-47883-C2-1-P and ANR-11-IDEX-0003-02
In order to reduce the background that could limit the precision of the diagnostics located in the ATF2 post-IP beamline, a single vertical beam halo collimation system was installed in March 2016. In this paper we present the measurements done in March and May 2016 in order to characterize the collimation system performance. Furthermore, the collimator wakefield impact has also been measured and compared with theoretical calculations and numerical simulations in order to determine the most efficient operation mode of the collimation system in terms of halo cleaning and negligible wakefield impact.
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-MOPG40  
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TUPG05 Simulation of Bunch Length and Velocity Dependence of Button BPMs for Linacs Using CST Particle Studio® pick-up, simulation, linac, proton 319
  • M.H. Almalki
    KACST, Riyadh, Kingdom of Saudi Arabia
  • P. Forck, T. Sieber, R. Singh
    GSI, Darmstadt, Germany
  At non-relativistic velocities at a proton LINAC, the electromagnetic field generated by the beam has a significant longitudinal component, and thus the time evolution of the signal coupled to the BPM electrodes depends on bunch length and beam velocity. Extensive simulations with the electromagnetic simulation tool CST Studio® were executed to investigate the dependence of the induced BPM signal on different bunch lengths and velocities. Related to the application, the simulations are executed for the button BPM arrangement as foreseen for the FAIR Proton LINAC. These investigations provide the required inputs for the BPM system and its related technical layout such as analogue bandwidth and signal processing electronics. For the BPM electronics, it is important to estimate the contribution of the harmonic used for the data processing. Additionally, the analogue bandwidth of the BPM system is determined from studying the output signal of the button BPM as a function of bunch length at different beam velocities. This contribution presents the results of the simulations and comments on general findings relevant for a BPM layout and the operation of a hadron LINAC.  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-TUPG05  
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WECL01 Longitudinal Phase Space Diagnostics for Ultrashort Bunches With a Plasma Deflector plasma, laser, electron, injection 597
  • I. Dornmair, A.R. Maier
    CFEL, Hamburg, Germany
  • I. Dornmair
    University of Hamburg, Hamburg, Germany
  • K. Flöttmann, B. Marchetti
    DESY, Hamburg, Germany
  • A.R. Maier
    University of Hamburg, Institut für Experimentalphysik, Hamburg, Germany
  • C.B. Schroeder
    LBNL, Berkeley, California, USA
  We present with simulations a new method to diagnose the longitudinal phase space of ultrashort electron bunches. It harnesses the strong transverse fields of laser-driven wakefields to streak an electron bunch that is injected off-axis with respect to the driver laser. Owed to the short plasma wavelength and the high field amplitude present in a plasma wakefield, a temporal resolution around or below the femtosecond can be achieved with a plasma length of a few millimeters. We will explore the limitations on the time resolution, the calibration, and the influence of error sources such as beam loading and jitters. Amongst the possible applications are experiments aiming at external injection into laser-driven wakefields, or the diagnostics of laser-plasma accelerated beams.  
slides icon Slides WECL01 [5.430 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WECL01  
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WEPG79 Time-Resolved Measurement of Quadrupole Wakefields in Corrugated Structures quadrupole, emittance, electron, focusing 840
  • C. Lu, T. Jiang, L.B. Shi, L. Zhao
    LLP, Shanghai, People's Republic of China
  • F. Fu, S. Liu, D. Xiang, P.F. Zhu
    Shanghai Jiao Tong University, Shanghai, People's Republic of China
  • R. Wang
    SINAP, Shanghai, People's Republic of China
  • Z. Zhang
    TUB, Beijing, People's Republic of China
  Corrugated structures have recently been widely used for manipulating electron beam longitudinal phase space and for producing THz radiation. Here we report on time-resolved measurements of the quadrupole wakefields in planar corrugated structures. It is shown that while the time-dependent quadrupole wakefield produced by a planar corrugated structure causes significant growth in beam transverse emittance, it can be effectively canceled with a second corrugated structure with orthogonal orientation. The strengths of the time-dependent quadrupole wakefields for various corrugated structure gaps are also measured and found to be in good agreement with theories. Our work should forward the applications of corrugated structures in many accelerator based scientific facilities.  
poster icon Poster WEPG79 [2.362 MB]  
DOI • reference for this paper ※ DOI:10.18429/JACoW-IBIC2016-WEPG79  
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